Firstborn
(重定向自Firstling)
A firstborn (also known as an eldest child) is the first child born to in the birth order of a couple through childbirth. Historically, the role of the first born child has been socially significant, particularly for a first born son in patriarchal societies. In law, many systems have incorporated the concept of primogeniture, wherein the first-born child inherits their parent's property. The firstborn in Judaism, the bechor, is also accorded a special position.